ORIGINAL: Rustproofcorn
Hmmm I thought the stock was 5mm.
Nope 1/8" this is the one you want
http://www.amainhobbies.com/product_...s-Motor-3800kV
With this esc
http://www.amainhobbies.com/product_...C-w-SmartSense
Or the combo with the 1/8 shaft you can use the 5mm but you would need to find pinions.